CVE-2026-25555

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-06-08. a secondary CVSS source baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 2%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

OpenBullet2 through version 0.3.2 contains an authentication bypass vulnerability in the API key authentication middleware that allows unauthenticated attackers to gain admin access by supplying an empty X-Api-Key header value. Attackers can exploit the middleware's comparison of the supplied header against an empty AdminApiKey default string to access the admin console and all API endpoints without valid credentials.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
71.4%
KEV
Not listed

Published

June 8, 2026

Last Modified

June 9, 2026

Advisory Details (2)

Auto-updated Jun 20, 2026
No patch confirmed yet.
generic

OpenBullet2 0.3.2 Authentication Bypass via X-Api-Key Header | Advisories | VulnCheck

https://www.vulncheck.com/advisories/openbullet2-authentication-bypass-via-x-api-key-header
generic
https://hackernoon.com/one-empty-header-to-admin-how-an-auth-bypass-breaks-openbullet2

Vendor Advisories for CVE-2026-25555(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 0× in last 7d / 0× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-06 16:27 UTCEPSS rescore
  2. 2026-07-06 16:27 UTCEPSS rescore
  3. 2026-07-06 02:23 UTCEPSS rescore
  4. 2026-07-06 02:23 UTCEPSS rescore
  5. 2026-07-06 01:57 UTCEG score recompute
  6. 2026-07-06 01:57 UTCGHSA enrichment
  7. 2026-07-05 21:53 UTCEG score recompute
  8. 2026-07-05 21:53 UTCGHSA enrichment
  9. 2026-07-05 17:27 UTCEG score recompute
  10. 2026-07-05 17:27 UTCGHSA enrichment
  11. 2026-07-05 03:30 UTCEG score recompute
  12. 2026-07-05 03:30 UTCGHSA enrichment
  13. 2026-07-05 02:30 UTCEPSS rescore
  14. 2026-07-04 20:09 UTCEG score recompute
  15. 2026-07-04 20:09 UTCGHSA enrichment
  16. 2026-07-04 14:55 UTCEG score recompute
  17. 2026-07-04 14:55 UTCGHSA enrichment
  18. 2026-07-04 06:31 UTCEPSS rescore
  19. 2026-07-04 06:31 UTCEPSS rescore
  20. 2026-07-04 00:22 UTCEG score recompute
  21. 2026-07-04 00:22 UTCGHSA enrichment
  22. 2026-07-03 20:18 UTCEG score recompute
  23. 2026-07-03 20:18 UTCGHSA enrichment
  24. 2026-07-03 16:13 UTCEG score recompute
  25. 2026-07-03 16:13 UTCGHSA enrichment
Show 75 more
  1. 2026-07-03 09:23 UTCEG score recompute
  2. 2026-07-03 09:23 UTCGHSA enrichment
  3. 2026-07-03 00:58 UTCEG score recompute
  4. 2026-07-03 00:57 UTCGHSA enrichment
  5. 2026-07-02 20:26 UTCEG score recompute
  6. 2026-07-02 20:26 UTCGHSA enrichment
  7. 2026-07-02 16:22 UTCEG score recompute
  8. 2026-07-02 16:22 UTCGHSA enrichment
  9. 2026-07-02 12:18 UTCEG score recompute
  10. 2026-07-02 12:18 UTCGHSA enrichment
  11. 2026-07-02 07:28 UTCEG score recompute
  12. 2026-07-02 07:28 UTCGHSA enrichment
  13. 2026-07-02 03:23 UTCEG score recompute
  14. 2026-07-02 03:23 UTCGHSA enrichment
  15. 2026-07-01 23:19 UTCEG score recompute
  16. 2026-07-01 23:19 UTCGHSA enrichment
  17. 2026-07-01 19:14 UTCEG score recompute
  18. 2026-07-01 19:14 UTCGHSA enrichment
  19. 2026-07-01 15:08 UTCEG score recompute
  20. 2026-07-01 15:08 UTCGHSA enrichment
  21. 2026-07-01 15:06 UTCEPSS rescore
  22. 2026-07-01 15:06 UTCEPSS rescore
  23. 2026-07-01 11:03 UTCEG score recompute
  24. 2026-07-01 11:03 UTCGHSA enrichment
  25. 2026-07-01 06:54 UTCEG score recompute
  26. 2026-07-01 06:54 UTCGHSA enrichment
  27. 2026-07-01 00:57 UTCEG score recompute
  28. 2026-07-01 00:57 UTCGHSA enrichment
  29. 2026-06-30 23:22 UTCEPSS rescore
  30. 2026-06-30 23:22 UTCEPSS rescore
  31. 2026-06-30 20:52 UTCEG score recompute
  32. 2026-06-30 20:52 UTCGHSA enrichment
  33. 2026-06-30 16:26 UTCEG score recompute
  34. 2026-06-30 16:26 UTCGHSA enrichment
  35. 2026-06-30 08:24 UTCEG score recompute
  36. 2026-06-30 08:23 UTCGHSA enrichment
  37. 2026-06-30 04:19 UTCEG score recompute
  38. 2026-06-30 04:18 UTCGHSA enrichment
  39. 2026-06-29 23:58 UTCEG score recompute
  40. 2026-06-29 23:58 UTCGHSA enrichment
  41. 2026-06-29 19:46 UTCEG score recompute
  42. 2026-06-29 19:46 UTCGHSA enrichment
  43. 2026-06-29 15:42 UTCEG score recompute
  44. 2026-06-29 15:41 UTCGHSA enrichment
  45. 2026-06-29 11:36 UTCEG score recompute
  46. 2026-06-29 11:36 UTCGHSA enrichment
  47. 2026-06-29 07:32 UTCEG score recompute
  48. 2026-06-29 07:32 UTCGHSA enrichment
  49. 2026-06-29 02:27 UTCEG score recompute
  50. 2026-06-29 02:27 UTCGHSA enrichment
  51. 2026-06-28 22:23 UTCEG score recompute
  52. 2026-06-28 22:23 UTCGHSA enrichment
  53. 2026-06-28 18:19 UTCEG score recompute
  54. 2026-06-28 18:19 UTCGHSA enrichment
  55. 2026-06-28 14:07 UTCEPSS rescore
  56. 2026-06-28 14:07 UTCEPSS rescore
  57. 2026-06-28 14:01 UTCEG score recompute
  58. 2026-06-28 14:01 UTCGHSA enrichment
  59. 2026-06-28 09:57 UTCEG score recompute
  60. 2026-06-28 09:57 UTCGHSA enrichment
  61. 2026-06-28 05:53 UTCEG score recompute
  62. 2026-06-28 05:53 UTCGHSA enrichment
  63. 2026-06-28 04:56 UTCEPSS rescore
  64. 2026-06-28 04:56 UTCEPSS rescore
  65. 2026-06-28 01:43 UTCEG score recompute
  66. 2026-06-28 01:43 UTCGHSA enrichment
  67. 2026-06-27 21:30 UTCEG score recompute
  68. 2026-06-27 21:30 UTCGHSA enrichment
  69. 2026-06-27 17:26 UTCEG score recompute
  70. 2026-06-27 17:26 UTCGHSA enrichment
  71. 2026-06-27 13:22 UTCEG score recompute
  72. 2026-06-27 13:22 UTCGHSA enrichment
  73. 2026-06-27 09:18 UTCEG score recompute
  74. 2026-06-27 09:18 UTCGHSA enrichment
  75. 2026-06-27 05:14 UTCEG score recompute

Publicly available exploits

(1 reference)

Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Nucleihttp/cves/2026/CVE-2026-25555.yaml
    First seen Jan 1, 2026

    OpenBullet2 <= 0.3.2 - Authentication Bypass

    Open source ↗

Frequently asked(5)

What is CVE-2026-25555?
CVE-2026-25555 is a critical vulnerability published on June 8, 2026. OpenBullet2 through version 0.3.2 contains an authentication bypass vulnerability in the API key authentication middleware that allows unauthenticated attackers to gain admin access by supplying an empty X-Api-Key header value. Attackers can exploit the middleware's comparison of the supplied…
When was CVE-2026-25555 disclosed?
CVE-2026-25555 was first published in the National Vulnerability Database on June 8, 2026, with the most recent update on June 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-25555 actively exploited?
CVE-2026-25555 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 71.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-25555?
CVE-2026-25555 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-25555?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-25555, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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